package org.ray.veader.util;

public class Util {
	public String wrap(String str, int wrapLength, String newLineStr,
			boolean wrapLongWords) {
		if (str == null) {
			return null;
		}
		if (newLineStr == null) {
			newLineStr = "\n";
		}
		if (wrapLength < 1) {
			wrapLength = 1;
		}
		int inputLineLength = str.length();
		int offset = 0;
		StringBuffer wrappedLine = new StringBuffer(inputLineLength + 32);

		while ((inputLineLength - offset) > wrapLength) {
			if (str.charAt(offset) == ' ') {
				offset++;
				continue;
			}
			int spaceToWrapAt = str.lastIndexOf(' ', wrapLength + offset);

			if (spaceToWrapAt >= offset) {
				// normal case
				wrappedLine.append(str.substring(offset, spaceToWrapAt));
				wrappedLine.append(newLineStr);
				offset = spaceToWrapAt + 1;

			} else {
				// really long word or URL
				if (wrapLongWords) {
					// wrap really long word one line at a time
					wrappedLine.append(str.substring(offset, wrapLength
							+ offset));
					wrappedLine.append(newLineStr);
					offset += wrapLength;
				} else {
					// do not wrap really long word, just extend beyond
					// limit
					spaceToWrapAt = str.indexOf(' ', wrapLength + offset);
					if (spaceToWrapAt >= 0) {
						wrappedLine.append(str.substring(offset,
								spaceToWrapAt));
						wrappedLine.append(newLineStr);
						offset = spaceToWrapAt + 1;
					} else {
						wrappedLine.append(str.substring(offset));
						offset = inputLineLength;
					}
				}
			}
		}

		// Whatever is left in line is short enough to just pass through
		wrappedLine.append(str.substring(offset));

		return wrappedLine.toString();
	}

}

